Another quick fan tutorial for those of you that need some air in your bucket. And we'll be doing it on the cheap! . I found 12V fans online, and found some 12V batteries at Walmart that are used for key fobs, and other small electronics. I will be testing these batteries this weekend to see how long they can put out continuous power, but the price and the size was right. I didn't want a huge stack of AAs in my helmet.
Parts List:
1. Two (2) Evercool 40mm fans from NewEgg.com, the model number is EC4010M12CA, item # 35-119-049 - $2.99EA x 2= $5.98
These fans come with a yellow wire as well for speed control. Since we're not using a controller I just cut the yellow wire down at the fan.
2. Two (2) "N" battery holders from Radio Shack. I think these are made for slightly wider batteries but the 12Vs I picked up fit just fine, item #2700405. - $0.99EA x 2 = $1.98
3. 1 Pack of 2 sliding switches from Radio Shack, item #2750401 - $2.99
4. 1 Pack of 2 A23 12V batteries from Walmart - $3.47
5. Spool of red 18 gauge wire from Walmart (was the smallest they had) - $2.68
6. Soldering iron - already had
7. Solder - already had
8. Scissors, wire strippers
9. Electrical tape
Grand total for the project: $17.10.
First off, the diagram. This is for one (1) fan circuit, and I used two in my bucket - one for each side. I just figured it would be simplest with 2 independent circuits.
Now here's the wiring side of things:
Solder the wire coming off the positive lead of the battery holder to one of the switch terminals:
Solder the intermediate wire to the other switch terminal:
Run the negative wire from the fan (black) straight back to the negative of the battery. You could use black wire if you wanted, but I only bought one spool of wire, so both my positive and negative wires are red. Solder the other end of the intermediate wire from the switch to the positive (red) lead on the fan. My intermediate wires are both about 12" but that will vary depending on how you want to route them in your helmet:
And the two circuits complete and ready to be put in the bucket:
The soldering and wiring took about 30-40 minutes, and I plan on just taping the circuits in. Quick and simple